Samsung Galaxy M21s vs AT Mobile Viper
| Type | Touch | Slide |
| Dimensions | 159.20 x 75.10 x 8.90 mm | 98.00 x 48.00 x 17.00 mm |
| Weight | 191.00 g | 104.00 g |
| Display size | 6.40" | 2.20" |
| Display | Color / Super AMOLED 16M colors 60 Hz 1080 x 2340 px (6.40") 403 ppi | Color / TFT 256k colors 240 x 320 px (2.20") |
| Display protection | Corning Gorilla Glass Buy screen protector
 |  |
| Additional display | | |
| Protection of the secondary display | | |
| Talk time (max.) | 4G: 2880 min. (48.0 h) | 2G: 210 min. (3.5 h) |
| Stand-by (max.) |  | 2G: 120 h. (5.0 days) |
| Playback time (max.) | Audio: 119 h (5.0 days) Video: 26 h (1.1 days) | nd |
| Internet browsing time (max.) | WiFi: 21 h (0.9 days) 4G: 21 h (0.9 days) | nd |
| Standard battery | Li-Ion 6000 mAhBuy powerbank
| Li-Ion 750 mAhBuy powerbank
|
| Quick battery charging | Fast Charging | |
| Wireless battery charging | | |
| Phonebook memory | | 300 places |
| Internal memory | 64 GB | 64 MB |
| End-user memory | 49.2 GB | |
| RAM memory | 4 GB | |
| Memory cards |  microSD, microSDHC, microSDXC up to 512 GBBuy memory card | microSD |
| Operating system | Android 10 | - |
| Interface | One UI 2.0 | - |
| Processor | Samsung Exynos 9611 | - |
| Processor clock | 2300 MHz | - |
| GPU | ARM Mali-G72 MP3 | - |
| Touchscreen | | |
| DualSIM | | |
| SIM cards standard | DualSIM(nanoSIM, nanoSIM) | |
| DualSIM mode | dual standby | nd |
| Hybrid DualSIM | | nd |
| Announced | 4Q 2020 | |
| Other names | SM-F415F/DS | - |
| GSM frequencies | 850 900 1800 1900 | 900 1800 1900 |
| UMTS | 850 900 1700 1900 2100 | |
| LTE standard | FDD LTE: 2600, 2100, 1900, 1800, 1700, 900, 850, 800, 700 TDD LTE: 2600, 2500, 2300 | |
| Standard 5G | | |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Camera type | Standard | |
| Photo sensor model | Sony IMX682 | |
| Photo matrix | 64 Mpx | 2 Mpx |
| Optical zoom | | |
| Digital zoom | 8x | 6x |
| Flash | LED | |
| Dual-colour LED flash | | |
| Video resolution | 3840x2160 px | 176x144 px |
| Video formats | H.264, H.265, MPEG4 - 30 fps | |
| Additional | AF, f/1.8 | - |
| Second camera | | |
| Camera type | Wide-angle | nd |
| Photo matrix | 8 Mpx | nd |
| Optical zoom | | nd |
| Field of view | 123 ° | nd |
| Flash | LED | nd |
| Dual-colour LED flash | | nd |
| Video formats | H.264, H.265, MPEG4 - 30 fps | nd |
| Additional | FF, f/2.2 | nd |
| Third camera | | |
| Camera type | Macro | nd |
| Photo matrix | 5 Mpx | nd |
| Optical zoom | | nd |
| Flash | LED | nd |
| Dual-colour LED flash | | nd |
| Video formats | H.264, H.265, MPEG4 - 30 fps | nd |
| Additional | FF, f/2.2 | nd |
CAMERAS - FRONT
| First camera | | |
| Camera type | Portrait | nd |
| Photo matrix | 32 Mpx | nd |
| Optical zoom | | nd |
| Flash | | nd |
| Dual-colour LED flash | | nd |
| Video formats | H.264, H.265, MPEG4 - 30 fps | nd |
| Additional | FF, f/2.0 | nd |
SENSORS
| Accelerometer | | |
| Proximity | | |
| Light | | |
| Magnetometer | | |
| Gyroscope | | |
| Barometer | | |
| Altimeter | | |
| Gravity | | |
| Hall-effect | | |
| Iris scanner | | |
| Fingerprint scanner | | |
| Thermometer | | |
| Hygrometer | | |
Data transfer
| xHTML | | |
| WAP | v2.0 | v2.0 |
| HSCSD | | |
| HSDPA | 42.20 Mbit/s | |
| HSUPA | 5.76 Mbit/s | |
| HSPA | | |
| HSPA+ | | |
| LTE DL | 603.00 Mbit/s | |
| LTE UP | - | |
| WIMAX+ | | |
| GPRS | | class 10 |
| EDGE | | |
| Bluetooth | v5.0 LE | |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 a/b/g/n/ac | |
| WiFi frequencies | 2,4 GHz; 5 GHz | |
| WiFi Direct | | |
| WiFi Display | | |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v2.0 Type-C | v1.1 |
| GPS | | |
| A-GPS | | |
| GLONASS | | |
| Beidou | | |
| Galileo | | |
| QZSS | | |
| NFC | | |
COMMUNICATION AND MESSAGING
| Call waiting | | |
| Conferency | | |
| Call forwarding | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | 200 places |
| EMS | | |
| MMS | | |
| Dictionary | T9 | T9 |
| Swype | | |
| e-mail client | POP3, IMAP4, SMTP | |
| Hardware QWERTY keyboard | | |
| RSS Reader | | |
Multimedia
| Radio | | |
| MP3 | | |
| Stereo speakers | | |
| Audio Jack | 3.5 mm | |
| HD Voice | | |
| Sound formats | 3GA, AAC, AMR, AWB, FLAC, IMY, M4A, MID, MXMF, OGA, OGG, OTA, RTTTL, RTX, WAV, WMA, XMF | |
| Polyphony | | 40 voices |
| Video ringtone | | |
| Ring composer | | |
| Games | | |
| Java | ART | MIDP 2.0 |
| Videophone | | |
| DVB-H television | | |
| TV-Out | | |
PIM AND ADDITIONAL FUNCTIONS
| Watch | | |
| Stopwatch | | |
| Alarm | | |
| Calculator | | |
| Currency converter | | |
| Organizer | | |
| Calendar | | |
| Flight mode | | |
| SyncML | | |
| Data and fax | | |
| Screensaver | | |
| Themes | | |
| Interchangeable covers | | |
| Voice dial | | |
| Speakerphone | | |
| Recorder | | |
| Vibrations | | |